code: def get_debugger(backend: str | None = None) -> Debugger:
      if backend is not None and backend in _debugger_registry:
          return _debugger_registry[backend][1]
      debuggers = sorted(
          _debugger_registry.values(), key=lambda x: -x[0]
      )
      if not debuggers:
          raise ValueError("No debuggers registered!")
      return debuggers[0][1]
  
imports: from __future__ import annotations
  from collections.abc import Hashable
  import dataclasses
  import inspect
  import threading
  from typing import Any, Protocol
  import jax
  from jax import tree_util
  from jax._src import core
  from jax._src import debugging
  from jax._src import traceback_util
  from jax._src import util
label_desc: Use image node_id 2 for calling a global function with example usage: get_debugger(backend) and returns: debuggers, _debugger_registry